Flames are the heat and light energy that is release when the chemical bonds in a substance are broken. What provides the chemical potential energy in a candle?

A. spark

B. heat

C. wax

D. water

Which nuclear emission has no charge and no mass? (1) alpha particle (3) gamma ray (2) beta particle (4) positron

Pb (BO2) 2 chemical name

Arrange the elements given below in the increasing order of their atomic size. Element A 1s22s22p6 
Element B 1s22s2
 Element C 1s22s22p63s1
 Element D 1s22s22p3

Lillian multiplies two numbers as follows: A x B = C Given that A has five significant figures and two decimal places and B has six significant figures and four decimal places, which equals the number of significant figures in C?

What is the purpose of adding naoh to the solution of acetylsalicylic acid?

Which is not a characteristic of a compound? It is a mixture of elements. It has properties that differ from its component elements. It has a fixed proportion of elements.

Can you think of other possible ways scientists can determine what climate was like in the past besides studying ice cores?

Which sub-layer thins out into space, where there is no air

Complete and balance the molecular equation, including phases, for the reaction of aqueous ammonium bromide, nh4br, and aqueous lead (ii) acetate, pb (c2h3o2) 2.

A magnesium atom has 2 valence electrons in its third shell. Which is a TRUE statement about what happens when it forms an ion? A. It will be an anion. B. It will have more electrons than protons. C.